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Logical Database Design

Logical Database Design
A foreign key may be null and still adhere to the referential integrity constraint.

False
True

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Logical Database Design
Weak entities do not get mapped into a relation.

True
False

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Logical Database Design
In a 1:M relationship, the primary key on the one side migrates to the many side to become the foreign key on the many side.

True
False

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Logical Database Design
The relational model consists of:

data in the form of tables.
operations using non-SQL languages.
data redundancy.
unorganized data.

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Logical Database Design
A relation has which of the following properties?

Each relation has a unique name.
Each row is not unique.
The order of the columns is significant.
Attributes can have the same name within a given table.

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Logical Database Design
The primary key of the new relation in a many-to-many relationship is a composite key comprised of the primary keys of each of the binary entities.

False
True

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